Regardless, the head had no hair. But eventually people started replacing these things with plastic Synthetic polymers can be classified as addition polymers, formed from monomer units directly joined together, or condensation polymers, formed from monomer units combining such that a small molecule, usually water, is produced during each reaction.
The answer is yes, its unethical and it is cruelty to animals and there is just no reasonable justification. Polymers are giant molecules with molar masses ranging from thousands to millions. His research in led to the idea that these compounds were actually macromolecules that were made up of over 10, atoms instead of being groups of small molecules This mixture is then heated under atmospheric pressure to liquefy the polymers so they can then be injected into the cast mold via an injection plunger.
The results suggest that GMP polymer has excellent potential to be used in in vivo gene delivery. The key to the polymer structure is that two carbon atoms can have up to three common bonds and still bond with other atoms.
They were all made of ivory and since ivory is very rare and hard to obtain it raises the prices of all items made of this material. Fur is the oldest form of clothing and it has been worn by humans for varies of reasons through out history; its natural appearance, texture, fashion, color and snow does not melt during outdoor activities.
With the use of polymers scientist were able to create an effective and cost efficient substitute for metals and ivory, which we used to use for making common items such as handles, pool balls, and game pieces.
Karl Ziegler and Giulio Natta received a Nobel Prize for their discovery of catalysts for the polymerization of alkenes.